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QTR-HD-25A Reflectance Sensor Array: 25-Channel, 4mm Pitch, Analog Output
| pitch × sensors | size (mm) |
output | max current | optimal range |
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| LED | board | ||||
| 4 mm × 25 | 101.0 × 16.5 | analog | 30 mA | 405 mA | 5 mm |
This array of IR LED/phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage and separate controls for the odd and even emitters. In general, the closer the object, the higher the contrast between light and dark readings, but high-reflectance objects are generally detectable out to around 50 mm. This version features the traditional-style QTR sensors without lenses.
Alternatives available with variations in these parameter(s): sensor type sensor count sensor pitch output type Select variant…
| Description | Specs (15) | Pictures (7) | Resources (6) | FAQs (0) | On the blog (1) |
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QTR-HD-25A Reflectance Sensor Array. |
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QTR-HD-25A Reflectance Sensor Array, front and back views. |
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QTR-HD-25A Reflectance Sensor Array dimensions. |
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Pinout diagram of a QTR-HD-xA Reflectance Sensor Array. |
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Demo of IR LED dimming and independent even/odd control on the QTR-HD-07x (as seen through an old digital camera that can see IR). |
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Schematic diagrams of individual QTR sensor channels for A version (left) and RC version (right). This applies only to the newer QTRs with dimmable emitters. |
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The QTR Reflectance Sensor Arrays are available in many different sizes. |
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